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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

897
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
897
Potentiometry: Overview01:06

Potentiometry: Overview

3.0K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
3.0K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

1.0K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
1.0K
Electrodes: Overview01:17

Electrodes: Overview

1.9K
 Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in...
1.9K
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

343
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
343
Potentiometer01:30

Potentiometer

1.2K
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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Multi-analyte Biochip MAB Based on All-solid-state Ion-selective Electrodes ASSISE for Physiological Research
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Self-Powered Potentiometric Sensors with Memory.

Sunil Kumar Sailapu1,2, Neus Sabaté2,3, Eric Bakker1

  • 1Department of Inorganic and Analytical Chemistry, University of Geneva, Quai Ernest-Ansermet 30, CH-1211 Geneva, Switzerland.

ACS Sensors
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a self-powered potentiometric sensor that remembers ion concentration changes over time. It can detect if an analyte concentration deviates from its baseline or exceeds a set threshold, useful for environmental monitoring.

Keywords:
capacitordiodeionsmemorypH sensorself-powered sensor

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Area of Science:

  • Electrochemistry
  • Sensor Technology
  • Environmental Monitoring

Background:

  • Potentiometric sensors offer real-time ion activity monitoring via spontaneous voltage.
  • Existing sensors often lack memory or self-powered capabilities for long-term deployment.
  • Continuous monitoring of ion concentration fluctuations is crucial for environmental assessment.

Purpose of the Study:

  • To develop an advanced, self-powered potentiometric sensor with memory functionality.
  • To enable the detection of concentration deviations and threshold exceedances within a defined time.
  • To create a deployable sensor solution with minimal electronic components.

Main Methods:

  • The sensor harvests and stores energy in a capacitor, regulated by a diode.
  • Additional driving electrodes shift the potentiometric signal to activate the diode.
  • A single voltage measurement across the capacitor records ion activity changes over a set interval.

Main Results:

  • The sensor successfully recorded incurred pH changes in a river water sample over 2 hours.
  • The memory function allowed detection of ion activity deviations irrespective of returning to baseline levels.
  • The self-powered design operated effectively with minimal electronic components.

Conclusions:

  • This novel potentiometric sensor provides a self-powered, memory-enabled solution for monitoring ion activity.
  • The technology is promising for deployable environmental sensors to track ion concentration relative to thresholds.
  • The design simplifies monitoring by requiring only a single voltage measurement at the end of the observation period.